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PLAISTOW — A Bartlett woman was charged with driving while intoxicated after she rear-ended a Plaistow police cruiser that was stopped at traffic lights Monday morning.

State police trooper Tyler Dodds said he believes 67-year-old Susan Bernier was impaired when she struck the cruiser around 8:25 a.m. on Route 121A near Sanborn’s Candies.

According to Dodds, a Plaistow officer was stopped at a red light at the Route 125 intersection and was preparing to turn right onto the highway when her cruiser was hit from behind by Bernier’s 2011 Nissan Murano.

Plaistow police Capt. Brett Morgan identified the officer as Sgt. Dorothy McGurren, who was on patrol at the time.

McGurren got out and spoke to Bernier before she was later transported to Parkland Medical Center in Derry to be evaluated as a precaution, Dodds said.

Bernier was not hurt.

While State Police believe Bernier was impaired, Dodds said they have not ruled out a medical issue as another possible factor.

Bernier and McGurren were traveling alone at the time of the crash, which caused little to no damage. Dodds said the cruiser was driven from the scene and remains in service.

State Police were asked to conduct the investigation because it involved a cruiser from the Plaistow Police Department.